You don’t have to spend a fortune to get your hands on a trainable robot arm. Take LittleArm for instance. It is a 3D printed Arduino robot arm for STEM students. This 4-axis robot has an interchangeable gripper. This is an open source product, so you can add sensors and customize how it behaves.
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Demos of 3D Printed Arduino Robot Arm: LittleArm
This robot arm is controlled by Arduino. The kit ships with an Arduino Uno, mini breadboard, 3D printed plastic components, servos, and everything you need to get started.
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